package com.itheima.reggie.Filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
@WebFilter(filterName = "LoginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request=(HttpServletRequest) servletRequest;
        HttpServletResponse response=(HttpServletResponse) servletResponse;
        String requestURI = request.getRequestURI();
        log.info("请求的路径为: {}",requestURI);
        //定义不需要处理的请求路径(需要放行的)
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/upload",
                "/common/download",
                "/user/sendMsg",
                "/user/login"
        };
        boolean check=check(urls,requestURI);
        if (check){
            filterChain.doFilter(request,response);
            return;
        }
        Long currentId= (Long) request.getSession().getAttribute("employee");
        if (currentId!=null){
            BaseContext.setCurrentId(currentId);
            filterChain.doFilter(request,response);
            return;
        }

        //4-2、判断登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("user") != null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("user"));

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request,response);
            return;
        }
        log.info("用户未登录,跳转到登录界面");
        R<Object> r = R.error("NOTLOGIN");
        response.getWriter().print(JSON.toJSONString(r));
        return;
    }
    //判断路径
    private boolean check(String[] urls, String requestURI) {
        for (String url : urls) {
            boolean flag = PATH_MATCHER.match(url, requestURI);
            if (flag) {
                return flag;
            }
        }
        return false;
    }
}
